Process of making burs.



F. E. & P. DE F. WARNER.

PROCESS OF MAKING BURS. APPLICATION mu) OCT-1,1915.

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C 6 ion 1-143" the process of warren FRANK 'E. WARNER AND PERCY DE F. WARNER, OF

MANUFACTURING COMPANY, OF WATEBIBURY, CON- ASSIGNORS TO SCOVILL s ra'rns ra'rnn'r OFFICE.

WATERBURY, cormnc'ricu'r NECTICUT, A CORIEORATION OF CONNECTICUT.

PROCESS OF MAKING BURS.

Specification of Letters Patent.

' 1915. Serial No. 53,576.

To all whom it may concern:

Be it known that we, FRANK E. WARNER and PERCY on F. WARNER, citizens of the United States, residing at WVaterbury, in the county of New Haven and State of onnecticut, have invented a certain new and useful Improvement in Processes of Making Burs, of which the following is a full, clear, and'exact description.

There is more or less insistent demand, in various parts of the country, in the overalls trade, for garments having the joints riveted, with the upset end of the rivet clenched over a washer or bur in a more or less symmetrical manner. Aside from the holding strength of the rivet, its appearance seems to have some influence on the purchasers. But it is not always easy to make the clenched end of a rivet symmetrical and attractive. This clenched end of the rivet stands more or less conspicuously above the bur or washer Without being obstructive or otherwise in the way. This outstanding clenched end is not always uniform in construction or appearance.

The object of our invention is to provide a cupped or capped bur in which the leading end of the rivet is clenched, concealed and anchored in such way that the external end of the riveted device as seen will always present a uniform symmetrical appearance.

The invention forming the subject of this case is divided out of our application filed July '19, 1915, Serial No. 40,709, in accordance with the requiremnt of the Patent Office, and the invention herein consists in making cupped or cappe bur from a suitable burs by drawing up the eyelet is drawn,.the

blank essentially as an cupped. portion being left intact and constricted, as by knurling at its base next to the flange, and this knurled cupped portion then closed down or' flattened so as to reduce its height and reduce the diameter of its tack entrance and otherwise collapse this cupped portion soas to simulate the clenched end of a hand or a machineclenched rivet, the cupped, capped or closed end bur receiving within it the point of the rivet and admitting of such point being up-r set, clenched or. riveted within it and serving as well to anchor the clenched end of the and inclose it, all as we to explain and finally rivet and to conceal will proceed now clalm.

In the accompanying drawings illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is aplan view and Fig. 2 is a crosssection of the blank. Fig. 3 is a plan view and Fig. 4: is a cross-section representing the final drawing step by which the blank of Figs. 1 and 2 is converted into a cupped blank. Fig. 5 is a plan View and Fig. 6 is a cross-section of the knurled.cupped blank. Fig. 7 is a plan view. Fig. 8 is a cross-section and Fig. 9 is a finished bur. Fig. 10 is a plan view of enough of the machine to illustrate the knurling step, and Fig. 11 is a cross-section on the line A B of Fig. 10, and on a larger scale. Fig. 12 is a partial elevation and cross-section of the dies for closing down or rducing the cupped and knurled bur. Fig. 13 is a cross-section showing a tack set with the bur upon pieces of fabric.

The word knurled and its derivatives are used in the shops to express a spinning operation and are to be so understood here.

The blank, 1, may be of copper or other suitable ductile metal, and it is drawn into cupped form in any suitable way, substantially as eyelets aredrawn, for example, so as to produce the cupped device 2, substantially as shown in Flgs. 3 and 4 This cupped device comprises the elongated hollow portion or cup 3 and the flange 1. This thus cupped blank is then passed through a machine, comprising essentially a rotary die 5 and a stationary complemental die member or matrix 6, the adjacent faces of which are grooved and headed substantially as shown in Fig. 11, to grip the hollow portion 3 of the blank just above the flange 4: and reduce it or constrict it externally and internally, transferred to the reducing dies 7, 8, in which the hollow portion is flattened, that is to say, its height is reduced and it is somewhat laterally extended, and its center depressed, as shown at 9, whereby to simulate the end of a rivet clenched or set by a hand to afford an opening only Patented Apr. 18, 1916. Serial No. 40,709. Divided and this application filed October 1,

side elevation of the and then the thus knurled blank is large enough for the entrance of-the tack and supplying an anchorage for the upset tack point.

The rivet, (usually a tack of relatively soft metal), is passed through the object to be riveted, and its point extended into the constricted mouth 10 of the bur and'upset and spread within the hollow portion 3 so that the tack and bur will be interengaged, or in other words, the point of the tack will be upset or clenched Within the hollow por tion of the bur and the tack will be anchored in the bur, but instead of the end of the tack being exposed, it will be upset and concealed within the bur, and thus a uniform symmetrical and unobtructive and unobstructive finish will be given to the riveting.

\Vhile we have shown the preferred form of bur and described the preferred method of producing the bur, yet it is to be understood that We deem the principle of our invention as herein claimed, susceptible of variations.

What We claim is 2- 1. The process of making burs having a hollow portion for inclosing and concealing the end of the rivet, which consists in cupping a blank to form the hollow portion and simultaneously fianging that end of the blank next to the open end of the cupped portion, then knurling the cupped portion adjacent to its flanged portion and thereby constricting such cupped portion externally and internally, and then flattening down the cupped portion into close proximity to the flanged portion and thereby displacing the metal transversely and reducing the diameter of the entrance to the cupped portion.

2. The process of making burs having a hollow portion for inclosing and concealing the end of the rivet, which consists in cupping a blank to form the hollow portion and simultaneously flanging that end of the blank next to the open end of the cupped portion, then knurling the cupped portion adjacent to its flanged portion and thereby constricting such cupped portion externally and internally, then flattening down the cupped portion into close proximity to the flanged portion and thereby displacing the metal transversely and reducing the diameter of the entrance to the cupped portion, and indenting the face ofthe cupped portion. In testimony whereof we have hereunto set our hands this 29th day of September A. D. 1915.

- FRANK E. WARNER. PERCY DE F. WARNER. Witnesses:

C. P. CooK, E. A. HYDE. 

